Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is wider than the river

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

The ball will travel towards the center of the circle and fall down
None of these
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
It will fall down at the same place where the string breaks

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